I work at TW
We spoke about this issue in our management meeting this morning. Your trailer came with several plugs for the holes in the floor. You are supposed to plug off the holes that you don't use. We did this because everyone has different track lengths and different ways of loading the trailer. In essence, everyone wanted the holes in a different spot so we put the holes throughout the floor and you need to plug the ones that aren't under your track based on how you normally use the trailer. Basically, there are too many holes but it gives you the flexibility to use the holes you want/need. Plugging the ones you don't use will limit the flow going through the floor and make the holes that are open blow harder. It should also divert air flow back to your other vents. Be aware that anytime you have the pusher fans on, you'll divert some air from the other ducts even if you do have some of the holes in the floor plugged. The plugs are black and they're in a clear bag inside your trailer.
I'm sorry you didn't get this info when you called. My name is Jon and I'm an avid snowmobiler. Feel free to ask for me if you need to call again. I'd be happy to help.